LANSING — Gas dipped below $3 per gallon at some stations in Michigan, but prices began rising at other pumps late Monday morning.

Michigan's average gas price is $3.33 per gallon of regular unleaded fuel, according to Dearborn-based auto club AAA Michigan. It's down 10 cents over the week and 58 cents lower than the same time last year.

Two Marathon gas stations in Shelby Township sold gas for $2.99 per gallon earlier this morning, according to MichiganGasPrices.com. But at around 10:30 a.m. the site began receiving user-submitted data that some stations in Michigan were increasing prices as much as 42 cents, said Patrick DeHaan, senior petroleum analyst for GasBuddy.com. MichiganGasPrices.com is part of GasBuddy.com.

The price spike should be fairly short-lived, and more stations will probably sell gas for less than $3 per gallon by Thanksgiving, DeHaan said.

"Bad news with regards to the economy means good news at the pump," he said."If this shutdown lingers it could put even more downward pressure on gas prices."

Wholesale gasoline and oil prices are down despite the fact that there's little government data available on jobs or the economy because of the shutdown that began Oct. 1.

"There's no solid evidence of what's going on with the economy, but traders are just getting prepared that this shutdown could really slow down the economy," he said.

The Monday morning price spike likely came since some stations were selling at thin margins, DeHaan said. Some probably were even losing money on gasoline.

The Saginaw-Bay City-Midland areas' average gas price of $3.21 is the least expensive compared to nine other Michigan metro areas in AAA's fuel gauge report. Marquette has the highest average of $3.45 per gallon. (See more metros here.)

AAA bases its report on a survey of 2,800 Michigan gas stations. Monday's price report is based on the last credit card transaction at each station on Sunday.

The national average price is $3.35 per gallon of regular unleaded fuel, down from $3.40 last week, according to AAA. Michigan ranks in the middle of the pack compared to other states. Hawaii has the most expensive gas at $4.22, while Missouri has the lowest average price of $3.06.